I realized that I never returned to this thread to say how this problem was resolved for me.
I emailed them, and after some back and forth in which they asked me about my phone model, service provider, etc. they sent me these instructions.
Good morning, dear user.
We consulted with our service provider to verify where the problem may be occurring between sending and receiving the message and have opened an inquiry ticket.
Meanwhile, we will proceed to provide you with the validation code manually the next time you try to validate in the APP.
To get validated in the APP follow next steps:
1. Open the Alertcops application and it will ask you for validation as in previous occasions.
2. Once the code has been requested, and without closing the application, open the email and reply to this thread indicating that you have requested the new validation code.
3. We have a 24 hour service that will answer the email as soon as possible and will proceed to provide the code.
4. Once the code is received, go to the Alertcops application, is very important that the Alertcops App stay open, or the validation process while begin again.
5. Enter the provided code and the validation process will be completed.
I was able to successfully validate the app.