Mail Handler throws an error when testing

[Volodymyr]

Hi everyone, hope you're doing great.
Maybe someone can help me with such problem I faced for the first time.

When creating a Mail server, everything works correctly - a test confirms It.

When creating a Mail Handler during the test, an error appears:

Messaging Exception in service 'com.atlassian.jira.service.services.mail.MailFetcherService$MessageProviderImpl' when getting mail: Open failedjavax.mail.MessagingException: Open failed
The connection is no longer open, messages marked as deleted will not be purged from the remote server: outlook.office365.com until the next run.

I've checked others mail handlers and all are working fine so far. I checked with other settings and nothing has changed (e.g., another handler, default reporter).

Every time the logs show this error:
Jira-Incoming-email:
2022-01-14 09:51:40,592+0000 WARN [email_to_issue_133] http-nio-8080-exec-1744 Volodymyr_Kushnir 591x69346001x11 qyrwji 195.56.119.209,10.253.226.137,10.253.237.52 /rest/jira-mail-plugin/1.0/message-handlers/test Unknown execution id. This is probably a test run.

attlasian-jira-logs:
2022-01-14 11:20:51,623+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 12601
2022-01-14 11:20:51,642+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 11500
2022-01-14 11:20:51,713+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 12300
2022-01-14 11:20:51,730+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 12100
2022-01-14 11:20:51,752+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 12600
2022-01-14 11:20:51,769+0000 http-nio-8080-exec-1603 WARN Volodymyr_Kushnir 680x69685184x14 qyrwji 195.56.119.209,10.253.226.132,10.253.237.52 /secure/admin/IncomingMailServers.jspa [c.a.j.p.mail.webwork.ViewMailServers] Cannot find mail server with id 10700