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.
- Jon K
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