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Hi @Peter
I am so sorry about this inconvenience, I have tested on my side and see the same behavior as yours.
Several users have also reported this unexpected behavior. I also have some observations:
In Excel Web, Data Types section disappeared.
In Excel for desktop, Stocks is still visible, however, it would return a message like this when you select it:
The STOCKHISTORY function will return value as #CONNECT!
As for now, my recommendation would be raising feedback via Help > Feedback > Report a problem.
Another place you can do this is via Excel · Community. When you done submitting, please feel free to drop the link here so I and other people can upvote for you.
I hope this information helps.
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