Can Samsung S10 communicate with HC-05? (Arduino)

I stuck with this so many days.
My Samsung phone can be connected to HC-05, but after entered the MIT inventor app, it keeps alerting me error 507.
I pretty sure my code is correct.
Btw my HC-05 is V4.1.
Anyone has that experience before?
It would be really appreciated if you could give me some ideas, or share your thoughts.

why not show your blocks and the code?

Error 507 is ERROR_BLUETOOTH_UNABLE_TO_CONNECT. The MIT App Inventor app has failed to connect.

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