Hello, thank you for reaching out to Microsoft Q&A.
Did you create your Microsoft account using your Gmail address?
I understand that you would like to change this information in your Microsoft account:
- Date of Birth (D.O.B)
- Your Phone number.
- Email address (alias)
To make these changes in your account,
Open any web browser and sign in with your Microsoft account here - https://account.microsoft.com/profile
First, change the Date of birth in your account.
Then, under Account info, select Sign-in preferences.
You should be able to change the email address (alias) that you want to use as the primary address and change your phone number.
If you are changing the alias, please read the information in the article below:
Add or remove an email alias in Outlook.com
If I have misunderstood, please let me know and provide additional details so I can better assist you.