Can't delete account during Standard plan free trial

[松本ゆかり_マツモトユカリ_]

I'm no longer using this account and would like to delete it, but I'm unable to do so.

I'm currently in the free trial period of the Standard plan, and when I try to delete my account, I get the following message:

• User is last billing admin of a transaction account that has one or more active entitlements.
• User is last billing admin of a transaction account that has one or more non-cancelled subscriptions.

I also tried switching to the Free plan first, but that didn't solve the problem either.

Any advice on how to resolve this would be appreciated.