General Issues

Can’t log in
What could be the reason:
wrong email address  
the password is incorrect  
the user with the specified email address is not registered in the system
What’s the solution:
specify correct email address  
be sure to type the correct password  
reset password  
check the specified email inbox to be sure it's registered in the system  
register with a different email address
No email received
What could be the reason:
you entered an incorrect email address  
the letter got into the spam folder  
email server issues  
What’s the solution:
specify correct email address  
check your spam folder  
contact you mail server administrator
No connection to server
What could be the reason:
you do not have an internet connection  
the server is rebooting  
intermediate providers issues
What’s the solution:
check your internet connection  
you should wait for a while to reboot the server  
run traceroute command in your OS terminal, contact your ISP and provide them with this data
I can't see all metadata in Blynk.Apps
What could be the reason:
not all metadata can be viewed now due to it's not implemented yet
What’s the solution:
view full metadata list in Blynk.Console
wait for Blynk.Apps full metadata support and update Blynk.Apps regularly
Device is offline
What could be the reason:
connectivity issues
auth token was changed
Wi-Fi network SSID or password was changed
old version of library or even beta version is used
outdated ESP core version
What’s the solution:
check if the device is powered on
check your internet connection between the device and Blynk.Cloud (mind Wi-Fi signal strength and distance)
connect to your device and check if it's auth token matches one in Blynk.Cloud
be sure to use the latest version of library, otherwise re-flash and launch Device Reprovision process
check your ESP core version is up to date, otherwise re-flash and launch Device Reprovision process
"Not correct device" during add device
What could be the reason:
device board hardware is not supported by the Template
device Template ID mismatch
wrong Product Name 
What’s the solution:
be sure to use the hardware that is mentioned in Template's Info page
be sure you paste correct BLYNK_TEMPLATE_ID to the sketch
be sure you paste correct BLYNK_DEVICE_NAME to the sketch
I can't erase data from a device
What could be the reason:
some time is required to erase all device data
there was network disconnection during the command send
What’s the solution:
wait for up to 5 minutes and re-check device's data
check your network connection, re-send the command
There are no devices in Blynk.Apps Automation​
What could be the reason:
there are no templates you can use at the moment
there are no devices added and available to access
device template has no datastreams allowed for automations
What’s the solution:
create a template or ask your organization admin for it
add a device so you can access it from Devices tab
check for the template to have required datastreams are exposed to automations 
I press button or move slider and nothing happens to the device
What could be the reason:
connectivity issues
device issues
What’s the solution:
check your internet connection for both: device and smartphone/PC (Blynk is a cloud platform, there's no offline support)
be sure that device is powered on and has no circuit or physical damage
I can't download device report
What could be the reason:
connectivity issues
no data for the selected device
you have no permissions to do that
What’s the solution:
check your internet connection
no report can be provided for download if there's no data for it
contact your organization administrator
My hardware constantly disconnected
There are multiple reasons why your hardware could be disconnected. In order to eliminate some obvious reasons, please do the next:
Run ping blynk.cloud. If your connection is good you should see the ping less than 200ms. If you see the higher ping it could be a reason for disconnections
In case your hardware uses Wi-Fi - check your Wi-Fi signal strength, and make sure there is no other noise that case decrease the signal level
Make sure you don't use delay() instructions in your firmware, long delay in your sketch can break the persistent connection with Blynk Cloud
Checkout your serial console output, make sure it doesn't contain crashes or other error that may lead to connection interrupts
Make sure you don't send a huge number of virtualWrite commands per seconds. Blynk Cloud doesn't allow to send more than 20 requests per seconds. Connections that exceeds the limit are closed

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Can’t log in

No email received

No connection to server

I can't see all metadata in Blynk.Apps

Device is offline

"Not correct device" during add device

I can't erase data from a device

There are no devices in Blynk.Apps Automation

I press button or move slider and nothing happens to the device

I can't download device report

My hardware constantly disconnected