Final notice of alternate credentials deprecation - Azure DevOps Blog
Briefly

In November 2019, we announced that the alternate credentials feature will be formally deprecated in March 2020. Since then, a small number of users were grandfathered in with continued usage of existing alternate credentials, which have remained active until today.
The simplest of these alternative authentication methods would be replacing your alternate credential with a new personal access token. We also suggest you explore our new managed identity and service principal support, which might serve as a better fit for those that were previously using their alternate credentials to authenticate on behalf of an application.
Read at Azure DevOps Blog
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