@OmarAlmonte, I do not like these inconsistencies with REST v2.
In XML-RPC you can provide a list of 1000 IDs to any of the Data Tables, like the ContactGroup table.
In a piece of code that was replaced for REST v2, the Tags - List Tags endpoint raised this error today.
Cannot affect more than 100 tag_ids at a time.
The majority of the REST endpoints allows 1000 IDs to be passed through.