Hello,
I would live to help you regarding this issue.
The Samsung Galaxy Note 8, being manufactured, hence launched in 2017, with Android 7, Nougat, does not support Android 10 or further updates. Samsung thrives to provide with continuous updates, but only as long as the hardware supports them. You will receive security updates, but please understand, not a major OS update due the the reasons mentioned above.
If any other problem persists, try the following;
a. Reset the phone in Settings>General Management>Reset.
*Please backup your data as Resetting your Galaxy will erase all your data.
b. Ask for help online via Samsung Service Chat.
Thank you, if you need more help, don't hesitate to respond, and I'll be here as soon as possible.