If you wrongly denied permisson, you need to allow them from settings to use app features.
First, go to settings of your device.
![](https://celestialbrain.com/wp-content/uploads/2022/03/2022-03-06_21h45_12.png)
Then, apps > Instant Blood Pressure Tracker.
![](https://celestialbrain.com/wp-content/uploads/2023/10/2023-10-12_09h45_18.png)
Permissions.
![](https://celestialbrain.com/wp-content/uploads/2023/10/2023-10-12_09h40_09.png)
Tap Items in DENIED
![](https://celestialbrain.com/wp-content/uploads/2023/10/2023-10-12_09h47_03.png)
Then change them to “Allow access”
![](https://celestialbrain.com/wp-content/uploads/2023/10/2023-10-12_09h40_30.png)
Now all permissons moved to ALLOWED, and the app works properly.
![](https://celestialbrain.com/wp-content/uploads/2023/10/2023-10-12_09h49_17.png)