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outlook for Mac issue
This account cannot be added. The licence provided by your work or school does not enable access to Outlook for Mac. Please access your email through Outlook on the web instead. Learn More Getting t...
Are they Microsoft 365 business mailboxes? You either need a software subscription (most common) or the mailboxes are the cheap ones that do not include Outlook client support, only web mail.
I have more information in this article -
"This account is not supported in Outlook" error message
You can use either a personal or business subscription - the one-time purchase office suites do not enable client rights for business mailboxes. The free version in the Mac store also does not include a license for business accounts.