他社box使用時、アカウント付与頂きたいのですが、1名のみ共有頂く際に「無効にされたユーザーはコラボレーションに招待できません」と表示され共有して頂けません。他社、自社管理部門へ問い合わせした所、メーカー様へ問い合わせして下さいとの事でしたのでこちらで質問させて頂きます。
共有頂けない方は他社へ出向後自社へ復帰されましたが、他のシステム（MS365等）は問題なく使用しています。

I apologize for the inconvenience. To clarify, are you trying to share a file or collaborate with a user who has been disabled or deactivated in the other company's Box account? If that is the case, it is likely a restriction set by the other company's administrator, and you may need to reach out to them to enable the user or provide access for collaboration. As an AI assistant, I don't have the capability to directly grant or manage user access in another company's Box account.
The person who cannot be shared has returned to our company after working at another company, but they are able to use other systems (such as MS365) without any issues.