Hi Kunal, welcome to the Community!
Looks like you're entering a wrong two-step verification code. Do you have access to the device where two-step verification was set for this Bitbucket Cloud account?
If so, can you confirm you're using the right code for this account?
If any of the answers above is "no", then you can use one of the recovery codes that were given to you when you initially set up two-step verification. If you don't have them anymore, you can still obtain some recovery codes following the steps at Get recovery codes.
Let us know if you need any further assistance and we'll be glad to continue helping you.
Best regards,
Ana
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