Hello @Kanan Kulkarni , if you're not getting prompts in your Authenticator App for a given tenant, please reach on of the aforementioned tenant admins so he can require re-register multifactor authentication. After that you will be able to re-register MFA for your account.
Let us know if you need additional assistance. If the answer was helpful, please accept it and rate it so that others facing a similar issue can easily find a solution.