Square Reader Not Connecting

Questions
1

I have implemented the Flutter plugin for the Square Mobile Payment SDK and am currently using the production App ID. While attempting to connect the Square Reader through the Square settings screen, I receive a “Reader pairing successful” message; however, it is followed by the error:

“Reader unavailable: Unable to establish a secure connection to Square.”

From my end, I have already:

  • Updated the app signature (SHA-256) on the Square Dashboard

  • Activated the Square account

Could you please confirm if any additional setup or configuration is required to resolve this issue?

2

Do you mind providing me with the following?

  • Your application ID (not your access token)

  • The Location ID you’re having issues with

  • A timestamp of one example of this issue occurring (date, time, timezone)

3

my app id: sq0idp-QfPisfD-yzpV-RK2AyZwtw

location id: LVTQNWPT4YY0N

Error: Reader Unavailable, Unable to establish a secure connection to Square

Timestamp: 1:20 pm, 01/05/2026, Canadian Timezone

4

@Shubham2502 Can you also share the Mobile Payments SDK version you’re using?