If my Google OTP code was incorrect, how can I solve this problem?

You could solve this problem as follows:

1. Android

Touch the [3 dots] in the top right → Touch the [Settings] button → Touch the [Time correction for code] button → Touch the [Sync now] button (Wait for a second) → Try again 

2. iOS (iPhone & iPad) 

1) Run [Google Authenticator App] again. 

2) Run [Settings App] on your iPhone or iPad → Touch the [General] App → Touch the [Date & Time] → Turn on the [Set Automatically] (Wait for a second) → Try again