Parameter 'Tab URL': Syntax Error

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Posted on by CU01081819-0

The URL I am trying to use for a launch and attach to microsoft Edge in new tab has lots of "%" in it as it is a web PDF. Every time I try to add a second % to the first it throws the whole URL off and wont find the page. whenever I add a % to an existing instance it shows up with a "%". This will take the error message away but the flow will not complete because it simply doesnt open the page.

The Tab URL error message is a new one that I havent been able to find on any other message boards or questions online.

I have gotten this to work with other flows but have never had this much pain with it.

Please help!

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Power Automate Desktop

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi,

could you share the screenshot of flow and error - then it will be quite clear to understand what exactly the issue is.

Thanks & Regards,
Nived N
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CU01081819-0 4 on at

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This is the error message I get when I put the regular link in the flow

This was putting in the second % in front of the original instances. The error message disappears but it does not register the new tab and the flow just error messages and cant take control.

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi,

Try to enclose your url between %''%, take this example

%'https://www.as%20.com'%

This will work !

Also using %% instead of % can also work in your case, but not sure why it is working up as shown in your second screenshot :)

Thanks & Regards,
Nived N
LinkedIn: Nived N's LinkedIn
YouTube: Nived N's YouTube Channel
Blog: Nived Nambiar's Blogs
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Chinmay_Dhabal 10 on at

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If you prefer to decode the URL manually, you can replace the encoded characters in the URL string . Here's how you can achieve this:

Set the URL Variable:

Action: Set Variable

Variable Name: vTabURL

Value: https://example.com/your%25encoded%25url%20Name%23is

Replace Encoded Characters:

Action: Replace Text

Text: %vTabURL%

Find: %20

Replace with:

Store result in: vTabURL

Repeat the Replace Text action for each encoded character you need to replace:

For %25 with %:

Action: Replace Text

Text: %vTabURL%

Find: %25

Replace with: %

Store result in: vTabURL

For %23 with #:

Action: Replace Text

Text: %vTabURL%

Find: %23

Replace with: #

Store result in: vTabURL

Launch and Attach to Microsoft Edge:

Action: Launch and Attach to Microsoft Edge

URL: %vTabURL% You can use below url for checking what to replace with what:
https://www.w3schools.com/tags/ref_urlencode.ASP

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Riyaz_riz11 4,150 Super User 2026 Season 1 on at

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1st Approach:
SET varUrl TO $'''%%'''
WebAutomation.LaunchInternetExplorer.LaunchAutomationBrowser Url: $'''www.gmail.com\\%varUrl%3D''' WindowState: WebAutomation.BrowserWindowState.Normal ClearCache: False ClearCookies: False WaitForPageToLoadTimeout: 60 CustomUserAgentString: $'''''' BrowserInstance=> Browser5

You can try this steps, just copy paste it will works.
Just replace variable into url instead of %

2nd Approach:
SET varUrl TO $'''%%'''
Text.Replace Text: url TextToFind: $'''%%''' IsRegEx: False IgnoreCase: False ReplaceWith: $'''%%varUrl%%''' ActivateEscapeSequences: False Result=> Replaced
WebAutomation.LaunchChrome.LaunchChrome Url: Replaced WindowState: WebAutomation.BrowserWindowState.Normal ClearCache: False ClearCookies: False WaitForPageToLoadTimeout: 60 Timeout: 60 PiPUserDataFolderMode: WebAutomation.PiPUserDataFolderModeEnum.AutomaticProfile BrowserInstance=> Browser6

Here i had created the input variable to define the value

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Regards,
Riyaz

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