Hi,
In this forum, we use tag to define the problem category. Apparently, this is not a WSUS (windows-server-update-services) related problem and we cannot help much. Based on my research, it seems this is Power-Bi related and I find out a similar thread in Power-Bi community. We can refer below link to see if it helps. If it doesn't work, you may open a ticket in the Power Bi community.
https://community.powerbi.com/t5/Service/Data-Source-Credentials-Greyed-out/m-p/519216
Alex
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