Hey there!
Unfortunately I have not encountered this myself, so I think this is going to be a question for InstaMAT directly. Below I have provided some links to possible support channels, I think their forums is a great place to start! They have a pretty active moderation team which will be able to help you out and give you better idea of what is going wrong, since they will be able to see the details of your account from their back end side of the server.
Support link: https://instamaterial.com/2025/04/10/where-can-i-get-support/
InstaMAT Forums: https://community.theabstract.co/c/instamat/10/none
Best of luck! 😊
