Try enabling the module for your quotas.
Or if it is in the code for a module, change textarea back to editor and validation back to allowed_html
'type' => 'editor',
'validate' => 'allowed_html',
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¯\_(ツ)_/¯ Education, learning resources, TEL, AR/VR/MR, CC licensed content, panoramas, interactive narrative, sectional modules (like jrDocs), lunch at Uni of Bristol. Get in touch if you share my current interests or can suggest better :)