@Deborah179it is very common, and I found the solution in community center and applied it to our rentals.
Although first, I should say there are HUNDREDS of posts complaining about this, so please keep complaining. It is ridiculous this can't just be a line item added by the host.
Here the current work around:
In your RULES state, "Price does not include all tax. We must separately collect [xy city, county] occupancy tax of 10%, paid through AirBNB after you book and before you check in."
Remind guest of your rules in your welcome message.
Go to reservations, click "report a problem." Its badly named, but sends you to resolution center.
Select the guest and click "request money" and "extra services."
Ask for the amount of the tax and send a note reminding of the tax. Ask guest to "accept" to pay the tax.
Note when guest pays, there is no deducation or service fee, so that really helps.
If they don't pay, don't let them check in.
This has gone pretty smoothly for us. We only had one guest try to be sneaky "oh I already paid that" when he hadn't--but that same guest was very sneaky about violating occupancy limits as well. (Overshared about all of his family, we were supposed to count up the names and calculate that the total coming to our house was 2 more than allowed, rather than asking directly."
But, keep complaining. AirBNB will either get its act together and make it easy for hosts to comply, or all of the states will re-write their laws to make the taxes AirBNB's responsibility instead of yours (Oregon already did this at the State level; other states are following suit).