是因为支付宝只支持个别银行卡的余额查询，支持的银行：浦发银行、平安银行、宁波银行、网商银行、兴业银行。
支付宝查看银行卡余额的步骤：
1、首先打开手机然后找到支付宝，然后打开支付宝。
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2、然后输入自己的账号，输入账号之后，点击下一步。
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3、登录支付宝之后，点击右下角的我的。
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4、然后会看到银行枣旦卡，然后点击银行卡。
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5、然后会看到右下角有一个银行服务，然后点击银行服务。
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6、然后会看到有一个余额，然后点击余额。
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7、然后就可以查看到银行卡的余额了，也可以看到支付宝支持哪个银行查看余额了。
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