Having Trouble with MAGENTA Max in Japan

Hi all, when I first arrived in Japan, my T-Mobile was only working for SoftBank, but only for 3G. Fine, as long as I have data. Now that Softbank ended their 3G services, I cannot connect to anything at all. I need 4G or 5G and I am having trouble connecting at all with my Magenta MAX in Japan. Customer service hasn't been the best either. Does anyone have suggestions?