April 13, 2021

Legacy Protocol – Laptop Outlook Failures

We are trying to harden the security around our O365 environment that we moved to last year, and recently turned off basic / legacy protocols for the tenant. We checked successes first, and identified and made a conditional access policy for a few service accounts that had no other protocol to use, and finally switched the policy on.

We’ve had a handful (4 now) of laptops that now won’t log into Outlook when they try on their Win 10 laptops. It either gives a failure, or more commonly, they put in their username and password, it disappears as if it succeeded, but they are not logged in. The app says it is not licensed. Adding the EnableADAL=0 reg fix does nothing. It worked for a couple days on one laptop – then failed.

So we are at a loss – levering the power of Google has yielded nothing. We have a feeling we will see additional laptops as the grace period for not logging into an Office app expires for more employees. Logging into a different laptop works fine – so it’s something local after basic authentication is turned off.

Any ideas what this might be?

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