Hey there, welcome to the community!
Can you please share a quick screenshot or video recording of the steps you did?
To cover some grounds, please follow the instructions in our Help Center:
When you click the confirmation link from your email, make sure you log in a final time with the original email address or password on the account. That will verify the change and link your account to your new details moving forward.
Please let me know if it helps. If not, feel free to reach out directly to the support team for further investigation here. (Be sure to use your Figma email account, and mention what email you’re trying to change it to, so the team can see if it even took on our end.) Thank you!