Needing VPN login to retreive emails

I have been having issues retrieving my Outlook account emails.
Lately I have needed to login to my VPN before I can look at new mail in my Outlook account. If I go into the eM Client not using the VPN, I get a warning symbol and this message: “An Attempt to connect to [email protected] failed. This could be caused by temporary server unavailability or ioncorrect settings. Please check the settings or click on the warning symbol to try connecting again.”
Any thoughts or suggestions on what setting I may need to tweek or what could be causing this in general…TIA

Disable your VPN completely to test.

Also if you have any eg: Optionally installed Firewall / Security programs or Optionally installed Antivirus programs (other than what comes built-into the OS), try also completely those to test as well.