It says I need to upgrade or add billing when adding a property or calendar
This message means the property or calendar you're adding goes beyond what your current plan covers. The Sync plan (₹399 per property per month) covers a set number of properties; a genuinely new property beyond that needs to be added to your plan. If what you're adding is actually another room of a property you already have, the fix is not billing, it's picking 'another room of an existing property' instead of 'new property' when adding it.
First, check: is it really a new property?
Airbnb lists each room of a multi-room home as its own separate listing. If what you are adding is a room of a property you already pay for, not a separate address, add it as a room of the existing property instead of a new one; this needs no extra billing.
If it is a genuinely new property
Add it to your plan from the billing page. The added property is billed at the same ₹399/property/month rate as the rest of your plan, plus GST, starting from when you add it.
What if I'm not sure whether it's a new property or a room?
If it shares the same address and the same host as a property you already have, it's almost always a room, not a new property. See 'New listing: is it a new property or another room?' for the exact picker.
Does the free 'list and manage it for us' plan hit this limit?
No, that plan has no property cap. This message only appears on the paid Sync and channel-manager plans.
Message us on WhatsApp with your property name, the exact error or a screenshot, and which step you were on. We will try to reproduce it and reply the same business day.