How can I revoke Dropbox business access token?

It looks like your client is truncating the error message. I recommend configuring it to show the whole message, if possible.

For reference though, it would read:

Error in call to API function "auth/token/revoke": This API function operates on a single Dropbox account, but the OAuth 2 access token you provided is for an entire Dropbox Business team. Since your API app key has team member file access permissions, you can operate on a team member's Dropbox by providing the "Dropbox-API-Select-User" HTTP header or "select_user" URL parameter to specify the exact user <https://www.dropbox.com/developers/documentation/http/teams>.

That is, since the /2/auth/token/revoke endpoint happens to be a "user-linked" endpoint, you need to specify a particular user account when calling it, by including a "Dropbox-API-Select-User" header with the member ID of a team member. You can find more information here under "Member file access".