"Error: Sorry, we’re unable to contact (store) to place your order"
This error typically means that the order was not able to be successfully sent to the POS at that time. Typically, this is because the store is offline or disabled for one reason or another.
The suggestion for these issues, from OLO specifically, include the following:
Please advise the store location to run a POS Outages Report and to check out Is my store online and ready to receive orders?.