RexSystem1 voteoriginally by @Jackenmen on GitHub OP
Update:
Based on https://github.com/fluxerapp/fluxer/blob/746a75187a60b9ba16acd213ca7878a109d2200a/fluxer_gateway/src/utils/utils.erl#L65, I assumed that none of the endpoints support "+00:00" as timezone but it seems that this function is only used for parsing the communication_disabled_until field so it's possible that the issue is limited only to that endpoint. At the very least, I found that the POST /channels/{channel.id}/messages endpoint is more lenient and allows use of "+00:00".
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Comment by @Jackenmen
communication_disabled_untilfield so it's possible that the issue is limited only to that endpoint. At the very least, I found that thePOST /channels/{channel.id}/messagesendpoint is more lenient and allows use of "+00:00".