Via press release from the US Mint:
Simply put, there is an adequate amount of coins in the economy, but the slowed pace of circulation has meant that sufficient quantities of coins are sometimes not readily available where needed.
You may be experiencing this in your local communities. We are asking for your help in improving this coin supply issue. You can do so by paying for things with exact change and by returning spare change to circulation.
Until coin circulation patterns return to normal, it may be more difficult for retailers and small businesses to accept cash payments.
For millions of Americans, cash is the only form of payment and cash transactions rely on coins to make change.
We ask that the American public start spending their coins, depositing them, or exchanging them for currency at financial institutions or taking them to a coin redemption kiosk. The coin supply problem can be solved with each of us doing our part.
Can you spare a dime? The U.S. Mint asks Americans to cash in their coins. https://t.co/AzsWp52YxS
— CNBC (@CNBC) August 1, 2020