Can you give more information? How are you recording your heart rate? Are you using the Strava app or some other device like a watch? Have you enabled health data permission in Strava (https://support.strava.com/hc/en-us/articles/360000556410-How-Strava-Uses-Health-Related-Data)?

I am recording my heart rate with suunto 9. How can i enable health data permissions?

I couldnt find the data permissions in strava app

The instructions for both the app and website are in the link I shared.

From the You tab go to your Settings () and select Data Permissions.
From the Data Permissions settings page, tap the Health-Related Data option and select the “Allow” option.

Please check your date of birth in your profile, if it implies you are under 16 years old Strava will not allow the use of heart rate data. See https://support.strava.com/hc/en-us/articles/360000841610-Can-I-use-Strava-if-I-m-under-the-age-of-16

Thanksss