There could be several reasons why you are not receiving OTP messages:
Network issues: Poor signal or network congestion.
Carrier problems: Delays or blocks by your mobile carrier.
Device settings: Incorrect phone settings or issues with the messaging app.
Spam filters: Your device or carrier might filter OTP messages as spam.
How can I check if my OTP messages are marked as spam?
On Your Phone:
Open your messaging app and look for a “Spam” or “Blocked” folder.
In Google Messages, tap the three-dot menu > Spam & blocked.
With Your Carrier:
Check if your carrier offers a spam filtering service or app and review blocked messages there.
How can I unblock OTP messages on my phone?
Google Messages:
Open Google Messages.
Tap the three-dot menu > Spam & blocked.
Find the message and tap "Not spam" or move it to your inbox.
Samsung Messages:
Open the Messages app.
Tap the three-dot menu > Settings > Block numbers and messages > Blocked messages.
Find the message and unblock it.
iPhone Messages:
Open Settings.
Go to Messages > Blocked Contacts.
Unblock the necessary number.