Support null or empty values
As per the documentation under this section https://docs.microsoft.com/en-us/azure/active-directory/app-provisioning/customize-application-attributes#what-you-should-know it states that null values are not supported, however this is a business requirement for keeping data accurate in Service Provider applications.
For example, if a user has a landline number that is currently synchronised with a Service Provider, the user may subsequently move to a part of the business that doesn't support landlines. The AD administrator rightfully changes their landline attribute to a blank value, and the provisioning service will then never PATCH this change to the Service Provider meaning they are now out of sync.

Thanks for the feedback, we have work that’s being done to support this, although no ETA that we can share publicly.
/Arvind
1 comment
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Rikard Strand commented
Any news on this topic ?
Need it to keep data accurate in SaaS applications. I see that there are several topics on the same issue.