支付宝不计步，可能是因为支付宝客户端没有将计步开关打开。
具体解决方法步骤如下：
打开支付宝客户端，首页点击“更多”选项。
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然后在里面找到“蚂蚁森林”的选项，并点进去。
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打开“蚂蚁森林”后，点击“攻略”小图标打开。
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打开后就可以看到自己每天走的步数了，如果步数为零，说明计步没有开启。则需要点击“设置”按钮。
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在“设置”中，将打开“记录运动数据”，再将其按钮开启，支付宝就可以计步啦。
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以上就是解决支付宝无法计步问题的详细步骤。