Hi Hazem,
You can enforce 2FA in Bitbucket Team accounts (so the user needs to have a 2FA in order to be able to access the repository) but enforcing SSH is not currently possible.
I've checked our issue tracker and I couldn't find a feature request for that, but if you'd like, you're more than welcome to submit yours. You can do that at site/master.
Hope that helps,
Ana
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