Pots not appearing in FreeAgent / Xero
Pots (including Tax and Instant Access Savings Pots) aren't actually a separate account, so they won't display separately in FreeAgent / Xero. Your accounting software should show the total balance of your account, including any money in all Pots.
So, if you have £1,000 in your main account, £500 in a Regular Pot, £250 in a Tax Pot, and £200 in an Instant Access Savings Pot then your total balance is £1,950. This is the balance you'll see in FreeAgent / Xero.