After you file

All good points made above.
The message I receive on the where’s my refund site is:
“You may have entered your information incorrectly” (I didn’t) 
“Check with your tax preparer or software provider”
“Verify you received an electronic acknowledgement” I did when I filed. Almost immediately on 2/19/2021.  
I’m at a loss as to why this is occurring.  No liens or losses, no injured spouse, etc.  
I claimed HOH, as I was able to claim my daughter this year.  She is 18 and had a small summer job.  I did her taxes and assured she paid her taxes so I could claim her as a dependent.  
Other than that, I’m at a loss as to why it’s taking so long -