Unable to receive app verification code on my iPhone 16 Plus

"im not receiving sms codes: im tryna verify my number in walmart app and it dosent let me ise my number bc im not gettin a verification code"

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These Appear to be Sent by eMail:

1. Go here: One-time verification code not found in email  - Walmart
2. As it Reads: "What should I do? First, check to see if your inbox is full. If yes, clear out unnecessary emails to make space in your inbox. If it’s not your inbox storage, check your spam or junk folders and mark all emails with the address mpportal_donotreply@walmart.com as Not Spam. Finally, double-check the email address or phone number associated with your account and update it if needed."