Bitbucket – Git submodule update asking for user and password

I have two projects within the same bitbucket user, one of them is a submodule of the first one.

When I have changes in main project git fetch origin and git merge origin/master work fine, but as soon as I have any change at the submodule git fetch origin ask me for my user and password at bitbucket.

Why is that? both project have configured the deployment key at the bitbucket settings

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