[uMap] uMap - change of ownership error

[Tomas INFO]

I've created a map layers using awesome uMap tool but now I want to
transfer my *ownership* to a different person, but after choosing the new
owner and clicking "Save" I receive an error bar on the top of the screen
("An error occured"). Are there any prerequisites neccessary to
successfully transfer map's ownership to other person with different
account?

Thank you very much for your help! :)

Tomas
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