Also we found that there was some problem on App store side. – https://www.apple.com/support/systemstatus/
Most likely it was a cause of the problems.
Now follow these steps:
Log out of your Ruhavik account on your smartphone;
Completely close the application;
Then open the application;
Re-login to the application.
Also, additionally, try to reinstall the application.
If this will not help, please check on the web-version, do you see Subscriptions page in web version of Ruhavik. – https://ruhavik.gurtam.space/