I got bitten by an HOA changing the STR rules shortly after my purchase and I had rentals.
I received several lectures on the evils of HOAs and how I should’ve handled it differently. The kicker was I guess they didn’t consider that I was already distressed and realized I had made mistakes. Makes us realize why some children won’t honestly tell parents when they’ve made mistakes.
How strict is the HOA? Are there any other STRs in the neighborhood? Did they send you the letter after you listed on Airbnb of VRBO?
Is this property for STR only or do you live there?
Let’s take it one step further. What is considered acceptable rental / lease period? >7 days? >30 days? > 6 months? >12 months?
There may be a way to comply but still use The property for rental especially if another STR has been operating.
Oh and do you own or rent? If rent, there is nothing to be done. If you are an owner, you can have a voice as part of the HOA.