Signer URL not working on Mac

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We are integrating ESignLive with our ASP MVC site. I don't think this issue is specific to .NET, but I'm not sure where else to post it (sorry if it belongs in a different forum). Our application generates a signer url like this:
signerAuthenticationToken = eslClient.AuthenticationTokenService.CreateSignerAuthenticationToken(new PackageId(packageId), email);
SignatureURL = authClient.BuildRedirectToSigningForSigner(signerAuthenticationToken, new PackageId(packageId));
We then display the signature document in an iframe using the SignatureURL as the src. This has worked fine in Chrome, Firefox, and Edge. However, today I tried in Safari on a Mac, and instead of loading the document, it appears to be redirecting to (instead of This then fails because the login page has the X-Frame-Options header set to SAMEORIGIN, so the iframe remains blank. If I open the SignatureURL in its own window first, the document appears as it should, and then subsequent reloads of our page display the document in the iframe as it should. Do you know why this is happening, or what we can do about it? Thanks.

Reply to: Signer URL not working on Mac

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Hey jerrade, What version of OSX are you on? And what version of Safari? I am traveling, right now, and didn't bring my Mac with me to test, but I will see if I can get someone else to look into this.

- Michael

Director, Partner and Developer Technologies, OneSpan

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Reply to: Signer URL not working on Mac

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I tested on macOS version 10.13.3, Safari version 11.0.3. Thanks!

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