Refund not received.

Yes - slow down and act logically.  Patience is a virtue when dealing with the IRS.

Tax returns are opened and processed in the order received. As the return is processed, whether it was filed electronically or on paper, it may be delayed because it has a mistake including errors concerning the Recovery Rebate Credit and the Child Tax Credit, is missing information, or there is suspected identity theft or fraud. If we can fix it without contacting you, we will. If we need more information or need you to verify that it was you who sent the tax return, we will write you a letter. The resolution of these issues could take 90 to 120 days depending on how quickly and accurately you respond, and the ability of IRS staff trained and working under social distancing requirements to complete the processing of your return.

https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue

I agree with the other responses to this post however I would sujest you go on line to were's my refund and see if the tax return is being processed.

"Where is my return shows that it is still in process."

Then tell your clients how Lucky they are. There are plenty of people still waiting on that status from 2020 filings. At least your clients see a current status.