@stewart said in Can't get notifications on 1 firewall to work with Office365:
@bmeeks We have 60 units in production. They are about 75% static / 25% DCHP. That could work for some but not for others. Did you try using an app password?
It's been several months back, but I am pretty sure I tried the app password route and it would not work with the new Office 365 security settings. Microsoft's goal is to completely shut down simple password authentication for SMTP including app passwords.
You can postpone the inevitable for a short time by not turning on multifactor authentication, but eventually you will get forced over to MFA and lose simple password login.