Content sharing only works for characters within the campaign.
So if you are in a campaign, with content sharing enabled and someone owns Tasha's, you may make an artificer but only by using the Create Unassigned Character button from that campaign page or following the join link and clicking the Create character button.
If you try to make an artificer from your My Characters page, you will not be able to.
What is your issue?
Content sharing only works for characters within the campaign.
So if you are in a campaign, with content sharing enabled and someone owns Tasha's, you may make an artificer but only by using the Create Unassigned Character button from that campaign page or following the join link and clicking the Create character button.
If you try to make an artificer from your My Characters page, you will not be able to.
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You can likely find all your answers in the FAQ: (https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/142100-how-to-access-content-on-d-d-beyond-faq).
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