This issue is likely caused by your phone's service provider. However, the following steps might solve your issue:
1. Check Block spam messages (eg, the focus mode is set for iPhones etc)
2. Reach out to your phone service provider and ask them if they are experiencing problems receiving SMSs from the USA via Amazon SMS Service (PlayerAuctions' service provider).
3. Give it a bit of time, and then try again later. Perhaps your phone service provider is experiencing a temporary network glitch.
4. Try using a different phone or phone number.