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I've just replaced my Windows phone with an iPhone and trying to set up 2FA. The actual Apple ID is about 12 years old and as such, the 2FA was not enabled by default. It's probably a good thing....
Following Apple's direction for setting up the 2FA, logged in to my Apple ID via the browser to check on the trusted devices and phone numbers. Both my iPhone and MacBook shows up. What does not show up is adding trusted phone number for receiving text messages. Trying to edit the security settings does not have the option for adding trusted phone #:
Nor can I assign trust to devices, both of them can be removed, view the properties, but that's all I can do.
Any reason why in my account these settings are not available?
Two things that might be the reason, but I am not sure.
The phone # had been transferred from the previous carrier. While that should not have anything to do with it, the phone number is in use as a secondary trusted number for someone's Apple ID.
The MacBook is shared with one person, but have no issues with logging in to iCloud, nor does she to her account.
If these are not the reason, then I am lost....
I may have overlooked something in Apple's link below:
h**ps://support.apple.com/en-us/HT204915
Which is entirely possible....
Any suggestion would be appreciated....
TIA...
Following Apple's direction for setting up the 2FA, logged in to my Apple ID via the browser to check on the trusted devices and phone numbers. Both my iPhone and MacBook shows up. What does not show up is adding trusted phone number for receiving text messages. Trying to edit the security settings does not have the option for adding trusted phone #:

Nor can I assign trust to devices, both of them can be removed, view the properties, but that's all I can do.
Any reason why in my account these settings are not available?
Two things that might be the reason, but I am not sure.
The phone # had been transferred from the previous carrier. While that should not have anything to do with it, the phone number is in use as a secondary trusted number for someone's Apple ID.
The MacBook is shared with one person, but have no issues with logging in to iCloud, nor does she to her account.
If these are not the reason, then I am lost....
I may have overlooked something in Apple's link below:
h**ps://support.apple.com/en-us/HT204915
Which is entirely possible....

TIA...