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Intermittent UIA Error in Blue Prism When Logging Into Browser-Based App

dremille
Level 2

Hi everyone,

I’m running into an intermittent issue with a Blue Prism automation that logs into a browser-based system. We’re using Microsoft Edge (version 141.0.3537.57), and the application only works with UIA mode for input. The same VBO is used on two different servers for different processes that log into the same application. One server works fine, but the other occasionally throws the error below. Restarting the server fixes the problem temporarily, but obviously that’s not a long-term solution.


Here’s the error:
ERROR: Internal : Failed to perform step 1 in Write Stage 'Input Username and Password' on page 'Log In' - Unable to find a valid pattern - required: ValuePattern

There’s another process that runs before mine on the same server, and I suspect they might be using macros. Could a stuck macro or something similar be interfering with UIA mode?
Has anyone seen this before or have ideas on what could cause it? Any suggestions on what our support team should check—UIA dependencies, Edge settings, server configuration? Could prior processes be locking UI elements and causing this error?


Thanks in advance for any insights!

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