Very strange one... do you own the game or play through GamePass?
I own a digital copy of the game.
Very strange indeed. And you were definitely hosting?
I'll walk through the tests I've done with this issue:
- Started up the game with one other friend in the Fireteam, went into co-op campaign, started our first missions. Upon first checkpoint above the radar the message "Saving...failed" appears. Noticed you can do a manual save within the pause menu, same error happens. Decided to do an Xbox reset when we both noticed this happening. Turned Xbox off, unplugged for 10 seconds, came back into the game continuing with me as the host, same issue.
- Had a friend host, joined their Fireteam, began our first co-op campaign mission. Both of us again notice the Saving...failed message. No joy on manual save as well.
- Started a co-op campaign alone but joinable, went through the first mission until Saving...failed appeared. No other friends are in this test. No joy on saving. Had the friend I was testing with do the exact same thing, and same failed saving.
Pretty weird, right?
*Edit: When I first saw the save issue, I did do a quick search here in the forums, this was the newest thread with other people discussing the problem, but we're not the only ones, here's a few other exmaples, sadly without solutions:
https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/halo-5-can-t-save-during-co-op-campaign/7036364e-6076-4c1b-874f-7cfa832cd051/posts
https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/saving-issues-in-local-co-op/25ead71b-fb66-47b8-a61b-83a6cfda2dea/posts
https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/saving-failed/4dae0842-f53f-4c30-b438-3974a5fcf619/posts
