Here are the messages I am seeing in my logs on my system:
syslog:Jan 28 08:28:32 <my-device-name> onlyoffice-ds.mysql[892083]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:28:32 <my-device-name> kernel: [332365.072976] audit: type=1400 audit(1643376512.288:1691): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=892083 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:28:32 <my-device-name> kernel: [332365.200090] audit: type=1400 audit(1643376512.412:1692): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.mysql" name="/bin/systemctl" pid=892155 comm="mysql.server" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:28:34 <my-device-name> onlyoffice-ds.mysql[892326]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:28:34 <my-device-name> kernel: [332367.599355] audit: type=1400 audit(1643376514.810:1693): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=892326 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.180965] audit: type=1400 audit(1643376515.390:1694): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=892425 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> onlyoffice-ds.mysql[892437]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.300688] audit: type=1400 audit(1643376515.511:1695): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=892437 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.462763] audit: type=1400 audit(1643376515.675:1696): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.mysql" name="/bin/systemctl" pid=892501 comm="mysql.server" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.552427] audit: type=1400 audit(1643376515.763:1697): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=892527 comm="my_print_defaul" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.599179] audit: type=1400 audit(1643376515.811:1698): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=892576 comm="my_print_defaul" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:28:35 <my-device-name> kernel: [332368.738472] audit: type=1400 audit(1643376515.951:1699): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=892713 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:28:36 <my-device-name> kernel: [332369.706876] audit: type=1400 audit(1643376516.919:1700): apparmor="DENIED" operation="capable" profile="snap.onlyoffice-ds.rabbitmq" pid=892230 comm="async_5" capability=1 capname="dac_override"
syslog:Jan 28 08:28:38 <my-device-name> kernel: [332370.943784] audit: type=1400 audit(1643376518.156:1703): apparmor="DENIED" operation="capable" profile="snap.onlyoffice-ds.rabbitmq" pid=892913 comm="async_118" capability=1 capname="dac_override"
syslog:Jan 28 08:28:42 <my-device-name> kernel: [332374.908673] audit: type=1400 audit(1643376522.121:1704): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.rabbitmq" name="/bin/df" pid=893145 comm="sh" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:28:42 <my-device-name> kernel: [332375.394635] audit: type=1400 audit(1643376522.605:1705): apparmor="DENIED" operation="capable" profile="snap.onlyoffice-ds.rabbitmq" pid=892913 comm="5_scheduler" capability=12 capname="net_admin"
syslog:Jan 28 08:30:33 <my-device-name> onlyoffice-ds.mysql[894049]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:30:33 <my-device-name> kernel: [332486.177877] audit: type=1400 audit(1643376633.378:1706): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=894049 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:30:33 <my-device-name> kernel: [332486.304446] audit: type=1400 audit(1643376633.506:1707): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.mysql" name="/bin/systemctl" pid=894132 comm="mysql.server" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:30:35 <my-device-name> onlyoffice-ds.mysql[894298]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:30:35 <my-device-name> kernel: [332488.697419] audit: type=1400 audit(1643376635.897:1708): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=894298 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332488.877155] audit: type=1400 audit(1643376636.077:1709): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=894400 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> onlyoffice-ds.mysql[894412]: chmod: changing permissions of '/tmp': Permission denied
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332488.913079] audit: type=1400 audit(1643376636.113:1710): apparmor="DENIED" operation="chmod" profile="snap.onlyoffice-ds.mysql" name="/tmp/" pid=894412 comm="chmod" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332489.067378] audit: type=1400 audit(1643376636.265:1711): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.mysql" name="/bin/systemctl" pid=894471 comm="mysql.server" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332489.103136] audit: type=1400 audit(1643376636.301:1712): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=894493 comm="my_print_defaul" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332489.160421] audit: type=1400 audit(1643376636.361:1713): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=894542 comm="my_print_defaul" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:30:36 <my-device-name> kernel: [332489.381623] audit: type=1400 audit(1643376636.581:1714): apparmor="DENIED" operation="open" profile="snap.onlyoffice-ds.mysql" name="/etc/mysql/mariadb.cnf" pid=894681 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
syslog:Jan 28 08:30:37 <my-device-name> kernel: [332490.280880] audit: type=1400 audit(1643376637.481:1715): apparmor="DENIED" operation="capable" profile="snap.onlyoffice-ds.rabbitmq" pid=894207 comm="async_3" capability=1 capname="dac_override"
syslog:Jan 28 08:30:43 <my-device-name> kernel: [332495.919611] audit: type=1400 audit(1643376643.120:1716): apparmor="DENIED" operation="exec" profile="snap.onlyoffice-ds.rabbitmq" name="/bin/df" pid=895191 comm="sh" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
syslog:Jan 28 08:30:43 <my-device-name> kernel: [332496.672948] audit: type=1400 audit(1643376643.872:1717): apparmor="DENIED" operation="capable" profile="snap.onlyoffice-ds.rabbitmq" pid=894895 comm="2_scheduler" capability=12 capname="net_admin"
Is there a apparmor profile for this app? Anyone else running into this same issue?