One time pass code not working

If your iPhone is not working right, you might want to try restarting it:

Restart your iPhone - Apple Support

If text messages are still not coming through:

You might want to try checking your

Messages settings, &

cellular settings &

check with your cellular provider that your plan allows you to receive cellular data.

(iMessages uses wi-fi for Apple to Apple devices, and cellular for Android to Apple devices)

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Apple support articles that may, (or may not) help solve the difficulty:

What is the difference between iMessage and SMS/MMS? – Apple Support 

Another article: Set up Messages on iPhone – Apple Support 

says:

"Texts you send and receive using iMessage don’t count against your SMS/MMS allowances in your cellular messaging plan, but cellular data rates may apply." 

So here's all the info. on Cellular Settings:

View or change cellular data settings on iPhone – Apple Support 

If needed:

Messages Support Team Webpage:

There is a "Get Support" link (at the very bottom), of their website (link below)

Messages for iPhone, iPad, Apple Watch, and Mac - Official Apple Support

All the best :-)