Failed to assume control of Chrome

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Posted on by Dion_tw

Hi all,

This questions has probably been asked before, but i can't seem to get of Chrome anymore.

Now my script doens't do anything..

I check the extension, its still on and working. I already (just to be sure) deleted and installed it again.

Also, i deleted all cookies but nothing seems to be helping.

Anyone know why this suddenly happends??

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Power Automate Desktop

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VJR 7,635 on at

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Perhaps some tips from the official help around this error.

Error ‘Failed to assume control of Microsoft Edge/Chrome/Firefox’ - Microsoft Support

If you've done everything related to extension, check the very bottom of the above link..it has some pointers about a few more checks.
Dion_tw 66 on at

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Tried it all except:
Only for Chrome: Check and set the "exit_type" parameter to "normal" at %localappdata%\Google\Chrome\User Data\Default\Preferences
Don't know how to access it and check.
VJR 7,635 on at

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In Windows Run type %localappdata% and press Enter and check the above path
NikosMoutzou Microsoft Employee on at

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Hello @Dion_tw .

Please also check the following:
Check Windows Event Viewer for errors
Check whether PAD.BrowserNativeMessageHost.exe is running for your browser
Close all browsers
Open only the browser you are using for automation
Open Task Manager
Navigate to Details tab
Look for PAD.BrowserNativeMessageHost.exe
Look for errors in background script
Go to chrome extensions chrome://extensions/
Enable developer mode
Find Microsoft Power Automate extension
Click on background.html
This will open the developer tools
Check in Console tab for any errors
Check if the message host points to the right location
Open registry editor
Navigate to Computer\ HKEY_CURRENT_USER \SOFTWARE\Google\Chrome\NativeMessagingHosts\com.robin.messagehost
Check the value of the registry key
Check for company policies blocking the message host
Open registry editor
Navigate to:
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\NativeMessagingBlocklist
Computer\HKEY_CURRENT_USER\Software\Policies\Google\Chrome\NativeMessagingBlocklist
Check if there are any policies blocking the message host from running.
Note: By default, PAD registers the extension both in HKLM and HKCU hence NativeMessagingUserLevelHosts shouldn't prevent the extension from running. If native messaging is explicitly blocked via NativeMessagingBlocklist policy, make sure that "com.robin.messagehost" is added to your NativeMessagingAllowlist policy.
Dion_tw 66 on at

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Thanks! I opened it in notepad and saw 'Exit_type' on Crashed?? I changed it to 'Normal'. Doesn't seem to be helping?
VJR 7,635 on at

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Probably needs a restart, exit re-open, signout, or end from Task Manager etc.

Also check out steps from @NikosMoutzou
VJR 7,635 on at

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Probably needs a restart, exit re-open, signout, or end from Task Manager etc.

Also check out steps from @NikosMoutzou
Dion_tw 66 on at

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Thankyou for the extensive steps! I see no 'PAD.BrowserNativeMessageHost.exe' in my task manager under details? I also see this when i look at my background.html in the console: 'Unchecked runtime.lastError: Error when communicating with the native messaging host'.

Anything i can do to resolve this?
NikosMoutzou Microsoft Employee on at

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Hello @Dion_tw . Could you please inform me regarding the below:
Power Automate for desktop version
Have you downloaded Power Automate for desktop from Windows store?
Windows version
Are there any errors in the Event viewer?
Verified answer

Dion_tw 66 on at

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I found the solution! When I open Chrome and go to my designated website, the website automatically opens a second browser. Before this was never a problem, but as of yesterday, the robot apparently got confused and didn't know which window to take control over.

I solved it by navigating to the first screen of the website, close the second window and THEN do my actions. Still weird to me why this was never a problem before but okay..

Thanks anyway for all the help and tips! Much appreciated:)