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and when I try in sandbox mode I get this message ...
The gateway was working fine until recently. I have verified with Authorize.net that everything is working on their end.
I cloned your form in order to test it on my end. I cannot replicate your issue in my cloned form. I would like to recommend you to remove your authorize.net integration and integrate it with your form again.
Another point I would like to remark that to use your authorize.net in sandbox mode, you will need to create a Sandbox account at https://developer.authorize.net/hello_world/sandbox/. Please note that your API login and Transaction Key are also not the same as the Sandbox Mode on your live account. We have a user guide which is related to sandbox mode.
Would you please review the .gif image that is associated with my cloned form which is in sandbox mode.
If your problem persists, please let us know.