Power Bi files do not return on Teams Search

[UBComma]

We have Power BI files stored as files on Teams Channels but we're finding that they do not return in Search results. We tried searching exact file names, *.PBIX and similar, but nothing seems to return Power Bi files. Does anyone know why we can't see them in Search?

[#2]

Do all users have a Pro license?

[#3]

Not all users in our tenant, but I have a Pro license and I'm searching for my Power BI files and they do not return in a search. I have to know where they are and go to them directly.