Hi @AndrewC ,
Do you want to get a user's mailbox timezone setting?
Based on the needs that you mentioned, I afraid that there is no direct way to achieve your needs. Currently, there is no action supported in Office 365 Outlook connector to retrieve the Mailbox timezone setting of a specific user.
As an alternative solution, I think custom connector could achieve your needs. On your side, you could consider set up a custom connector based on Microsoft Graph Rest API, then define a proper action path within this custom connector to retrieve the Mailbox timezone settings for a specific user using the following action path url:
GET https://graph.microsoft.com/v1.0/users/{id|userPrincipalName}/mailboxSettings
or
GET https://graph.microsoft.com/v1.0/me/mailboxSettings
Please check the following article for more details:
https://docs.microsoft.com/en-us/graph/api/user-get-mailboxsettings?view=graph-rest-1.0&tabs=http
More details about creating a custom connector in PowerApps, please check the following blog or video:
https://gotoguy.blog/2017/12/17/access-microsoft-graph-api-using-custom-connector-in-powerapps-and-flows/
https://www.youtube.com/watch?v=dBCS1nPsDiE
Please take a try with above solution, then check if the issue is solved.
Best regards,