Invalid auth token ESP32

Hello folks,

I am new to Blynk and wanted to try the “Simple e-mail example” with an ESP32 D1 mini. Unfortunately I get the following error message:

[648] Connected to WiFi
[648] IP:
___ __ __
/ _ )/ /_ _____ / /__
/ _ / / // / _ / '/
//_, /////_
__/ v1.0.0-beta.1 on ESP32

[728] Connecting to
[819] Invalid auth token

I did not touch the original code, only entered SSID, password and auth code:

char auth[] = “bOEyio__J07DwSbEuoc2Qxa9-n_Jl4W5”;

// Your WiFi credentials.
// Set password to “” for open networks.
char ssid[] = “xxx”;
char pass[] = “xxx”;

Have had various codes sent to me, but the result is the same.

I have no idea about network technology and am therefore at my wits end. Maybe someone here has a good idea what is wrong.

Thank you in advance.

You seem to have the wrong Blynk library installed.
You need to un-install it, then download and install this version…


Thank you very much for the very fast help!
Yes, that was indeed the cause. Now I can log on to the network, am authenticated and the pressed key is recognized; unfortunately then again an error message:

[720] Connecting to
[876] Ready (ping: 44ms).
Button is pressed.
Guru Meditation Error: Core 1 panic’ed (Interrupt wdt timeout on CPU1)
Core 1 register dump:
PC : 0x00060021 PS : 0x00000001 A0 : 0x8008b3a3 A1 : 0x3ff9f870
A2 : 0x00000000 A3 : 0x00000000 A4 : 0x00000000 A5 : 0xb33fffff
A6 : 0x00000000 A7 : 0x00000000 A8 : 0x00000000 A9 : 0x00000000
A10 : 0x00000000 A11 : 0x00000000 A12 : 0x00000000 A13 : 0x00000001
A14 : 0x00060121 A15 : 0x00000000 SAR : 0x00000008 EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x3ffc6af4 LCOUNT : 0x00000000
Core 1 was running in ISR context:
EPC1 : 0x4008a886 EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x4008c18e

ELF file SHA256: 0000000000000000

Backtrace: 0x00060021:0x3ff9f870 0x4008b3a0:0x00000000

Core 0 register dump:
PC : 0x4008a886 PS : 0x00060034 A0 : 0x8008b069 A1 : 0x3

Any idea what’s going wrong now?

Not without knowing many more details about your sketch, hardware, connected devices etc.
In fact, all the details that you were asked to provide when you created this topic.


“invalid auth token” issue is fixed in v1.0.0-beta.3.
Note that using beta is not recommended for general public, as it is intended to be used only with the upgraded Blynk Cloud (however, most things will work as expected).