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Cannot Send Email to Exchange Online - Remote Certificate is Invalid

We have recently migrated from Exchange on premise to Exchange online with Microsoft 365.  When updating the SMTP information for Deploy, I am getting the following error:

"The remote certificate is invalid according to the validation procedure."

SMTP Server: smtp.office365.com:587
SSL/TLS: enabled (need only TLS)
Using account email address & password, tried multiple accounts

Anyone successfully got this setup, any suggestions would be greatly appreciated.  I have a ticket open with PDQ and Microsoft but have not found a solution yet.

Thanks,
Bethany

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