Signature name has an @ Symbol in it

Outlook signatures can be stored locally or using "Outlook roaming signatures".
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Proclaim only works with locally stored signatures, to use a local signature; within a new email you must go to the insert tab and select signatures and within the dropdown and the option for signatures on this device.
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If you cannot create local stored signatures, please contact your IT to enable local signatures with the articles below:
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​Outlook roaming signatures - Microsoft Support
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​Office 365 Outlook "signatures on this device" grayed out settings - Microsoft Community