by using `body=(tags_ids)`, it showed the ID (the number found in crm.tag.id) in the chatter, instead of the text. To overcome this, I had to collect the display_name and write the display name in the message_post, like so:
```
for rec in sale_order.tag_ids:
tags_list.append(rec.id)
tag_names.append(rec.display_name)
```

then write it as:
```
tag_names_str = ', '.join(tag_names)
invoice.message_post(body=f"Invoice Tags: {tag_names_str}")
```

This works perfectly for my requirements. But I wonder if there is a way for the tag to appear as badge (chip) in the chatter instead of plain text?