The Format required for the Self Sign in with SMS recently changed and guests can no longer use the autofill on their device to enter the phone number or they will get a format error message. The captive portal gives no information on the proper format and the only documentation I know of for the proper format is page 660 of the R1 guide. There is no way that a guest will locate and read 660 pages to figure out the correct format to enter their ohone number.
Thank you for highlighting the user experience issue.
Allow us to work internally and get this fixed.
In the meantime, could you confirm if you have also raised a support case for this issue.
RUCKUS Networks, CommScope!
Oddly enough is used the following format and it worked.
I hope that there's a fix for this because having to enter a +1 or another country code isn't the most efficient method. It worked for me, but give it a shot. You won't get the autofill once you approve the request however. I just receive a text that I just copy and paste.