In October, I received a charge notice for 219 + Washington state sales tax (the charges from last year and two months ago didn't include tax), yet the credit card only reimbursed 219.
Clear+ won't let Washington residents with a green card sign up, and the reimbursement means paying the tax out of pocket. I've never seen a business operate like this.
This is a tax that merchants pass on to customers; banks don't report taxes.
If they do start charging sales tax based on billing address, then you'll need to factor the tax into your card reimbursement calculations going forward. You can first check whether your credit card's reimbursement cap is a fixed amount, then ask Clear customer service for a breakdown of the charges to confirm whether this is a general price increase or specific to Washington State.
You said the charges from last year and two months ago didn't include tax, so was this one added by Clear on their own initiative, or is the credit card processor collecting it on their behalf under new rules? Also, if Washington State doesn't allow you to sign up with a green card, are you currently using a regular membership or registering with an address in another state? If tax gets charged every month going forward, and the credit card only shows the original price, do you plan to keep renewing or switch to another company?
Is this tax deduction only for Washington state residents, or are all states starting to charge it? From what I remember, Clear+ pricing is usually the same across states, but the tax may be calculated based on the billing address. Also, do the credit card reimbursement terms say "excluding taxes" or "based on the net amount"? If you can screenshot the charges on your bill and the credit card reimbursement explanation, everyone can help you see whether Clear changed its rules or the card issuer changed.