Hello there olesya243,
Thanks for posting here on the Apple Support Communities! This is a place where other Apple users can submit questions or respond to others to help lend a hand. Let's take a closer look as we do our best to provide some additional insight.
To get started, be sure to check that Apple's System Status is green for Find My: Apple - System Status
If that's good to go, are there any updates available for your device?
1.How to back up your iPhone, iPad, and iPod touch
2.Update your iPhone, iPad, or iPod touch
Otherwise, does the same thing happen when accessing the same feature from any other Apple devices?
Certainly keep us posted, we’re here for you every step of the way!
Take care.