'"Invalid HTML, CSS, or JavaScript found" when injecting Builderall's Facebook Messenger bot into GTM's Custom HTML tag configuration

I understand that GTM does not like plain HTML. It gives this response when attempting to publish the container: "Invalid HTML, CSS, or JavaScript found".

I saw part of my needed answer from a similar question: Invalid HTML when adding Facebook chat suppport code using Google Tag Manager?.

However, I don't know much anything regarding coding and just getting into it. Any help with injecting this 3rd party script into GTM would be greatly appreciated.

There are about 50,000 other people using this 3rd party software Builderall, and so if you can help me, you'll be helping them too, I'm sure.

<script id="builderall_ws_bot" src="https://chatbot.eb4us.com/bot.js" bot_id="7762" usr="22365"></script>


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