Using classic Outlook for Windows in business environments
We have some users that were affected by this issue. The version was 20026.20182. Typical fixes such as Quick Repair did not resolve the issue.
Updating to the latest version of Office apps resolved the issue for the users. The latest version is 20131.20090 and was released on June 25.
To update the apps on one machine, go to: Outlook > File > Office Account > Update Options > Update Now