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, outlook.office365.com 993 and smtp.office365.com 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