63021: Channel invalid content error

Message contains content that is rejected or unsupported by the messaging channel.

• Unable to upload the media used in the message because it is not supported by the messaging channel.
• Message contains components not supported in selected messaging channel
• Length of the parameters and the template text exceeds the allowed length of 1024 for WhatsApp.

• Inspect the media files being sent and confirm their MIME type is in fact supported by the messaging channel.
• Confirm message components follow character limitations, proper formatting, and channel specific rules mentioned in docs if applicable.
• Confirm WhatsApp template sends do not exceed 1024 characters, which can occur when placeholder text substitutions or translations are too long.