ASP.Net- C# sample code to FAX PDF documents

Question

I am new to FAX sending using RingCentral. I got the above error message while working with the code.

I added the below line to web config.

still, the error exists.

Do we need to replace the clientid and clientsecret id with our registered username and password?

Please help me to proceed with it.

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Please check https://github.com/dotnet/standard/issues/542

I was able to fix a similar issue by following the instructions there.

we are using 4.5.2 framework . Tried the code in this link but the same error is still there

Tyler850957020 · Answer

Please check https://github.com/dotnet/standard/issues/542I was able to fix a similar issue by following the instructions there.

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