Office 365 Exchange Plan 1 - Can't make server connection

I recently purchased some office exchange plan 1 licenses for my company.

Auto discovery did not manage to find the solution, neither did my manual setup.
Iv’e tried IMAP, 993 and 587

Could it be that plan 1 rejects external mail parties? Or am I doing something wrong here?

I’m looking for a replacement for outlook and wanted to try eM Client.

Thanks for your support

Kind regards

Kim Lesage

Never mind the question, I forgot to check the firewall settings for that account.
There was no problem after the change on the firewall.

Thank you