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Venkatesh Ramamoorthy 20Venkatesh Ramamoorthy 20 

Unable to Access Page - The value of a parameter contains a character that is not allowed or the value exceeds the maximum allowed length

Hi All, 

Error observed when creating or editing the users in salesforce sandbox.

Unable to Access Page
The value of a parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit. If the error still persists, report it to our Customer Support team. Provide the URL of the page you were requesting as well as any other related information.

Many thanks in advance!
Best Answer chosen by Anudeep (Salesforce Developers) 
Venkatesh Ramamoorthy 20Venkatesh Ramamoorthy 20
Issue resolved. Flow on the user object was causing the issue. 

Resolution: Check if any automation(Workflow/PB/Flow/Trigger) is active for the object you receive an error.
 

All Answers

VinayVinay (Salesforce Developers) 
Hi Venkatesh,

When do you see this error?  Check below references which has similar issue.

https://salesforce.stackexchange.com/questions/165824/the-value-of-the-parameter-contains-a-character-that-is-not-allowed-or-the-va
https://salesforce.stackexchange.com/questions/298176/the-value-of-a-parameter-contains-a-character-that-is-not-allowed-or-the-value-e
https://help.salesforce.com/articleView?id=000337856&type=1&mode=1

Thanks,
Venkatesh Ramamoorthy 20Venkatesh Ramamoorthy 20
Issue resolved. Flow on the user object was causing the issue. 

Resolution: Check if any automation(Workflow/PB/Flow/Trigger) is active for the object you receive an error.
 
This was selected as the best answer