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Two things I missed while implementing [MSC2140](https://github.com/matrix-org/matrix-doc/pull/2140/files#diff-c03a26de5ac40fb532de19cb7fc2aaf7R80).
1. Access tokens should be provided to the identity server as `access_token`, not `id_access_token`, even though the homeserver may accept the tokens as `id_access_token`.
2. Access tokens must be sent to the identity server in a query parameter, the JSON body is not allowed.
We now send the access token as part of an `Authorization: ...` header, which fixes both things.
The breaking code was added in https://github.com/matrix-org/synapse/pull/5892
Sytest PR: https://github.com/matrix-org/sytest/pull/697
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