Read multiple posts about "601ERRV:5, CustHdr_17 - ?:? - Invalid SMS Number." I have used multiple valid numbers and have deleted/readded several times. Any help?

See if this FAQ helps:

FAQ:   601ERRV:5  Invalid SMS Number

https://ttlc.intuit.com/community/bugs-and-error-messages/help/why-am-i-getting-601errv-5-custhdr-17...

See if this answer by TurboTax CatinaT1 helps:

https://ttlc.intuit.com/community/taxes/discussion/re-my-federal-e-file-is-not-going-through-i-m-given-the-following-error-message-601errv-5-cus/01/1680023#M596821

Also see this answer by TurboTax DawnC in the thread linked below.  She also says it may be possible to leave the phone number blank in the Intuit Account settings. 

https://ttlc.intuit.com/community/taxes/discussion/re-i-try-efile-but-i-get-message-invalid-sms-numb...

Also see this other thread with other out-of-country users with the same problem who were able to correct the error.  Several have posted anecdotes there about how they solved it.   If you continue to have trouble, post there, and they may be able to help you.

https://ttlc.intuit.com/community/taxes/discussion/my-federal-e-file-is-not-going-through-i-m-given-...

NOTE: 

A couple of users have said that even after making changes to (or removing) the phone in the Intuit Account, the efile problem still happened, until they logged out of TurboTax then logged back in. Apparently that reset something.

So if you make any changes to the phone number listed in your Intuit Account settings, after you save the settings, log out of TurboTax and close the browser. Then reopen it and log back in and try to efile.