Hi! I'm a Mexican nurse going through the process of getting my credentials validated so I can take the NCLEX, due to the pandemic and other bureaucratic stuff, SEP Is taking forever to fill out that form you need (constancia de registro de título y no sanción).
I'm pretty close to the process my sponsor is making trying to get that form, so whenever I get news from them, maybe that's when you could try to get it from them.
As they said to you, they do not send forms, the only two options would be if you go directly to mexico city or get someone to get it with a PODER NOTARIAL that specifies exactly what it is to be delivered written in the form, only a notario público can do that and I ignore if there are any ways of getting that (poder notarial) form anywhere out of Mexico.
I hope and that helps a little, let me know if you need any more info and I'll try to investigate here!
Alejandro campos
[email protected]