How do you validate an ID?

Hi, im trying to validate an ID, from the MIT app inventor.
Trying to seek in the spreadsheet if the ID exist on it.

how you store your data on Spreadsheet?
What have you done? show your blocks.

Captura de pantalla 2022-10-27 233134

Without knowing your script on spreadsheet, what's the responsecontent after Web.GotText?

Im not sure what you mean but if i may guess you are searching after this.

https:// .com /spreadsheets/d/ (Spreadsheet ID) /edit#gid=0

Web2.Url parameters ?
Web2.GotText responseContent ?