Signature on work emails

Hi,

I added to my email signature at work the rainbow infinity sign that says Autism Awareness and underneath that, I wrote abe clear and concise please. 

Am email has been sent to everyone saying we cannot have any banners etc on the email signatures. I asked my manager if mine was ok as it tells people how I need my communication and she said no, I cant have it as its a business directive. 

This is what it looked like below. Is there anything I can do or suggest? 

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