After years without a problem, my Blynk IOT is malfunctioning

[PeteKnight]

@chrome1000

Has something changed on the server side?

Yes, the server.now enforces the rule that each device must have a unique auth token.

My guess is that your four devices all use the same auth token. Is that correct?

Multiple devices using single Auth token

Multiple devices were sharing single template, used to work fine but now it is not working. Is the feature disabled from Blynk side? [Moderator note - topic title updated to reflect the actual issue. The topic title was originally “Multiple devices using single template” but the issue is actually caused by sharing the same Auth token across multiple devices]

ESP8266 blynk notification went off suddenly

I have 3 devices (ESP8266) using the same Template ID, Device Name, and AuthToken. All 3 are working fine. The power supply for all of them is also working perfectly. Everything was working great from January 2023 until last week. Suddenly, a notification appears as shown in the images below (went offline). And everything stops working. Nothing was changed, it just started to happen. Is there any plausible reason for this instability? Attached are photos. [1] [2] [3]

Pete.