Hi tertinek,
This could be caused by a number of issues, such as an incorrect URL, not having the correct permissions to access the iFrame or Signavio being temporarily down/under maintenance.
I would suggest double-checking that you have entered the correct URL, also making sure that you have all of the necessary permissions to access the iFrame. If this does not resolve your issue, then it may be best to contact Signavio support for further assistance.
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