Still works as of 22 June 2024. Note that you only need your GM and your first cross-faction alt to join the Community if the alt can post recruitment ads once promoted to Officer. So:
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Open Guild to recruitment: log onto your Guild Master, click on the Guild & Communities button, click on Recruitment and check your Guild is Listed in Guild Finder for your alt’s role
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Create a Guild recruitment Community: Click on create a new Community, click on the Community Settings button & check the “Cross-faction” box & set to Recruiting
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Invite your alt to the Community: click on the Invite Member button, create an invite link for your specific alt, and copy it
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Create a Guild Invite in Community chat: type something in Community Chat and open the chat in a new window by right-clicking on the chat name. Click on your Guild, click on Invite Member, and click on Link Post in community Chat (you may have to prefix the link with the Community channel number e.g. /5 [Guild: ] )
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Apply to the Community with your alt: log onto the Alt & paste the link (this didn’t work for me, it may take time for the server to recognise the cross-faction flag? So I searched for the Community and applied that way)
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Accept the Community application: log back to GM & accept the application by clicking on the Roster Tab, select “Applicants” from the drop down top-right & click Invite
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Apply to the Guild with your alt: log back to alt, click on Guild & Communities button, click on the Guild invite in your community chat
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Accept the application to Guild: log back to GM, click on the Guild & Communities button, click on the Roster tab, select “Applicants” from the drop-down button in the top right, and accept the application
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Accept the Invite: log back to alt, click on Guild & Communities button, click on "Invited to in top left, and accept the invitation