You figured out the right way to do it: porting an existing number. That is a good workaround for the easy way to do “service provider lookups” via an NPA NXX d

You figured out the right way to do it: porting an existing number. That is a good workaround for the easy way to do “service provider lookups” via an NPA NXX database like https://localcallingguide.com/lca_prefix.php https://localcallingguide.com/lca_prefix.php. I suspect that if you go there and enter your area code and NXX you’ll see it listed as your original landline provider and not your SIP provider. When you go to provision a phone number from Twilio’s own pool, you’ll often see that all of the numbers come from a small number of NPA-NXX-xxxx blocks and those blocks are the ones that many 2FA and user auth services reject. To get a little deeper into it, Twilio (in Canada at least) doesn’t often own the NPA-NXX block either. Around where I am, the blocks are generally owned by IrisTel, who is a SIP provider in their own right. An old client of mine that had a data residency/privacy issue (their client required all of their data to be processed in Canada) ended up provisioning some numbers directly with IrisTel and doing that integration using FreeSWITCH.