Added at 10:15 am on March 5:
The problem was due to the following problem of the Unified Authentication System IdP of ACCC from March 1. Now it has been resolved.

[Failure][Resolved] Unified Authentication System IdP Consent Confirmation | Academic Computing & Communications Center,University of Tsukuba
https://www.cc.tsukuba.ac.jp/wp_e/idp-trouble-2024-03-04/

Added at 5:45 pm on March 4:
For many of them, the problem seems to have been resolved. If you continue to have trouble accessing the site, please mail to voice@tulips.tsukuba.ac.jp with the date and time you accessed the site and what screen was displayed.

• The message "アクセス権がありません。 (We are sorry, but your account does not have access to this resource.)" is displayed after logging in to the unified authentication system, and the system cannot be used.
• When you select "同意" after unchecking the checkbox on the screen for selecting personal information to be provided after logging in to the Unified Authentication, the message "アクセス権がありません。 (We are sorry, but your account does not have access to this resource.)" is displayed, and even if you visit again, you cannot redo the permission to provide personal information.

The cause is under investigation. We apologize for any inconvenience caused.

Some e-journals and databases can be accessed remotely through the GakuNin service. For details, see "When you cannot access Tulips Warp…".
 (2024/03/04 Added)  We have learned that some users affected by this problem are also unable to log in to GakuNin. We sincerely apologize for any inconvenience caused over the long period of time.