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There is no row at position 0. (IndexOutOfRangeException)
Solution:
Although a more permanent fix to this solution is described in TFS 12606 (not yet released to prod), the quick fix is to create Quick Fix :
Create a new token for the candidates and send the test online URL back to the Course Provider so that they may pass this along to their candidate. Further details can be found in TFS 14125.Quick Fix:
1. Delete the old token if it exists. You can search for token using the following query:
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