If you’re testing the campaign message to your number in Step 5 and it failed, this is most likely due to Frequency Capping. You can read all about this guideline by Meta here: https://scribehow.com/page/Frequency_Capping__vZJC0_nURcGE9nvBNbZQww
A quick fix is to send a “Hi” message to your WhatsApp bot from the test number and then try sending the test message again.
To ensure this problem does not persist, we recommend interacting with your WhatsApp bot after every three messages.