I’ve created a new user in the WebUI and assigned it to the same group, giving it the same permissions as you did
I’ve first authorized myself by sending an /api/login POST call.
I’ve input the bearer token onto my “parent” collection directory and for the rest of the calls under it set them to “Inherit from parent” under the Authorization tab:
After authorizing myself, I’ve then sent an SMS message as can be seen in the very first image, had no issues whatsoever.
Kindly double-check the steps I’ve provided to see if you haven’t missed anything, since you’re getting an authorization error, I would guess you might be running out of time due to the fact that the bearer token has an expiration date. You can make a call like this to increase the time: