Commenter Permissions Not Working

We have long running projects, managed on Smartsheet, shared to the project team, with commenter access. This has been successfully working for many months. This week, I have had three colleagues reach out and say they are unable to post comments. Please can someone help. I have checked permissions and account logins are the same. I have even suggested restarting the laptop. Thanks. Seems to be working for most, but not all the team.

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