Hello @ZipRe_11,
Welcome! The Grant Permissions for Multiple Users option is only available on Business Accounts. You can read more about that here: How do I add users to my PayPal account?
This may also be helpful: What is the difference between Personal and Business accounts?
Also, I am sorry to hear you're running into issues passing a Security Check with your phone number. I'd recommend trying to reach out to our Customer Support teams by clicking "Contact" at the bottom of any PayPal page for further assistance.
Good luck!
- Jon K
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