Hi Brad:
Follow the procedure in my linked post, below. Perform every step, in order, and do not skip any steps. Make sure that you are signed into the correct Google/Gmail account that holds your Google Voice phone number in one browser tab, and sign into the OBiTALK portal in the other tab. Carefully examine the pop-up box that will show the Gmail address of the account it is asking permission to use. It must be the same account that holds a working Google Voice number
https://www.obitalk.com/forum/index.php?topic=13868.msg89076#msg89076