Я попробовал ваш код, и он работает хорошо. Вы можете попробовать нижеприведенную правильную строку base64, чтобы проверить и проверить, есть ли у вас правильная строка base64string
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wySQkvMkntY3J4kmbHCy2bJPCzu82d2bChGvOfB19b0I0n4Oj83pDl6vg8Tj3Z3du9EaCP/IWGDLGDFgOuVK3AVkessz1rIZOnGo1CShgwd4+5Gw3Q5xrOWrp/Q+1OC1rkJsecen7k4zvjJzI/VP+YvjwCZkmSxJJM8Lu82OXhePN5Itouq61vy/WMO7PgWzmc2M6NSELriAGDrk0rdDlh/nkMtZx+rever7JmOfE+87HRHeevhlxYaVa1WkP98wubz/eWBByB1A9frJmJCjpLD3n9Vs/hlJ+FP8An9WGb0pwhYzJJ6zOZ4ZJLEcPDM8tow+3MD+vvKvDnFk+mJHRx8RoxZxw+0ln8f7wrAZPLl+5YcbD987iscSL3n1j2zDhsq0Pc2f1CnwrI+8I3Q/cZta8/ZpO6f397KTlFfTr8NlA6z/efuJmDvI8PX2hM5AD6jwUOGSEk8OpkvNmGdzwuJ3z3PlzA/h+G/pJB3nqDK9PNjDLr2sHiSzW7KYaQZB9onJcdBmPD48AY26z9MsrJwuRTeHtnH5sLp2H2/6sUder5wgLHpFxk6M+O/xD21YOAOgPpEUyAHskv+AAwg95Hzp+pz42P1iCewD4cP8AZYGGxh9P+Znhu4iTls/js/z6Sbn1TwcEs64SZsfyeS8pDtkgfIx9uU28nh+1jfu9YQqee51D8B2t4o0Hfw2nxLP9cPw3WOL5cIAWBgHtgP7m8Ef2P/YB/svrcnRd77H/ACzHcfX0Tn8WMsPZGW/9u25yr6OvxiRccD+o0/1+ZWesp9T/AJYM/pvT/dlhMfvf1d7AXwmJewCPycoZDuw+Aef5fsfXgZtnANyT3uxJMkkm47/jmWZs2c8GW9F9dH3H8WMYMdT8BY0BDGt9j6Z1v2ijt0/2P7ivILhk/wBnvBGIYpnDjOT31elHH1HIfzO+rvuH/LMzRU/LmAp0flGX9LCNpH2M/wBQpMg/aA/mHcPyBdn+vvZGPSD5yP8ARHpmwexY7+1mRc41TWPWJYF1lgfQ1enLHxnc2iMCh8O/3ZlwZW3S2YMnuSSmHp4fJPIkMzHUzJJPfLyvLY4xYhZD654+2Z7m+ZHI6cn7r9f1BvMONK9zxZ32q9TMTZ677npgADQrJn5z+J8ACMZw9jJQMT6wxn6C/cvP2seE8ljZLH4IYNyUipyq9xnCKvuP0ZmxGSwp6SkQrarnNixf5efM5+cXpI77ZP1Ykdksv7mzlPqNd/Z/uGbTUyThJJJJPcz3/HM8hjjzLucJhNekh2Gb8mz8Tq1OowfeR0+yeZBCwDKOjJ2fmHxhNkpno+0ILoIc+wR6nefhgNB6Bxi6trGNetk1kM9TyvpEfc4zRTQX0BYQWWLrOfHrLDZfLuxdWeW/6LrP3xMMwxwBknuZnfDx5mZZz6/wxYxYkxYew235hzZJ3wqJQo7E6YOGHDke/wCwOG15sh3rqXbODwSenKxq+e7LDjvxGALJj7R7jEsB8QfVZ8izWXKmYjLd1lLYv0lf6D/bBKfIfY6mUnc8iT1NiSSzZmeExzjnE288ZDw2f1Or4izwVHKIB8A1+RkxgmHyPicEo4DWPMtmxZxqYLbE874wvWYucpZz/wCGCPffU+3b9pY8vj/7P3va+rjh6mfM8MmpMSSbkxJ/F4XN3BFi8wKAVdBZoQ63P6ePreKduX3Ww19rvhdWB5gPTmBR0ofDZ+5k2cImNbXfjP0k5/iOz72ZA3jjH9BOOB9epsmKZ6P2/wAiB8le/uZ1M2ks+09zwzJwZJnhs+JePMO+M8MRR56gmDQyr8PoTBA+Vk6WAGcoBAGF0c5sWrK61NMzGH2fwyBrMZMqR33j3hj5zi64zrj3XslldH53/UP7s4YvsM/HUAAADAEk2ZZZ4M9z3w7IT3O5OEk3M/wYizbXBYiQ5F3OS5kwYlRqYAM5lZ0oPLGls/K8Q8dbeiTZhoojh+lkecwNj14na2oxaRPEEZr6cBlAMr0ETtv0nx3Y3NucP6zb972YQBM8M8MssuZ3wUn24ZmbEk98M8rDyXSHL9SrM5xH2mZxYkhA97GQG2+PY9rDF3nz7Hq2cZEAvaK+vVlsrbn62TYDMbyfLIl2DO5RFvxLTZk8Qy+0kylPwNyeOGXc8M8PDuZlmZnNuZmZ74eHqXg4zuLECWj6dH/veQrKZeJmKI+vx+WxpjzOozKJx63u92Ta5DxLeZYD1R2R4O5bpw+0CCofSyMMPo3px5l1NmXf8CTPBme5mbuZZmxM8P8AB4LqXyxt9CS/oH6ED24kLJAaH1zL+fxAc4bPy9I5aemZqpzDpXxKtWwHzZHB3b99wz4hKEwB8LnL9sfmzMzM2cSy7mZup7mZvEzMzz5n+Cb4JnHxge+ZAQWhc6kjkGSd4M7ijDwax859HPiWQrKrlW7b3v8AS8mQtEnBXKI3A+vxF3NmJHO5i6PQ92O8PAH9/NmzOJ5ZZnhxdJ4Nm1N6pk4xwxv+OZluyF8+hFSOw9i8wDKZw69GIOZQmdPZZlfW/wAX1zg92x8lix+n1l6+r4/87Qno1oPQPBHpnnRVzOH7b80iLyvvPfGZZnhdTvgy6mZkmbEk8eLXOPaZ/h54WQI5+Fs1AHggOdsjvcgacnvPCWegsGd9vuyyzPdgBYBgsHcq9WCwko3j+RlxL6Sy2Z5dzwk61M39yQbDw2JGbGZNascJYsWOPN7XjQMazgspvMmvawPWWWB/Wc5T4eJ05Zbsw+LbB3ixlxOYKvQWl4ex+x8+vDMs8t3OMzYsST3JJYsTpJjqxJdTwxrhN8YkscMySTIWBzgsyA+9sSyLl46iMPMsvDFh+Ij1OLDj6Q5QPJn19ftupZmZ5eGbzeeBY4SThk1JjuSxYmxbN3U9WeCSYlBoohhlTL9Jc8GE1uk84jOh75ifQe7vL4+2OEsetiSTnzPcy7vNk4SxPDJ68JhkzYbHDYzYxZzP8G8R7MYBzmwSwHeJs7u5y98H4vE6ssCLHND7gZf6u7F7TZvMknDZ4S83njEwxHDwLElixdyanhkxY53ZGEy4wFiamXtO5vMGCzLzZ1Lgt2WMQOvjGMfv+C6nvh7nzMyfxzE7mSeEsWJOdDMmf4PDw3q5jUrOgcdahATwLZJY7go+ZHFpf7frjzNv15ZksSTMYsYmd8puSZ+LFiTEljUEmZMyYmeGeUyJ7TP7ZfrvxaRx6gz7E2Z2d2AxZvNnd5t5jn4zj+n9V/4/weWep9uPMzKTZxwkzJbsb4xYg4e5JsSe3Dz5vNns56MDGie/HlzZvwZfWepuuG0dt4cXz5k+3hYscJJy9z/Bn+Kzvlnbxj0nCTc7tyTMzYk4xZwz3kmWWzp/vqLnsnXi2nq3wWqfcL4i/sP+2LHDCZme+Xh4ec44ePM8dTJJJddTE4Y2ye0nDGIOI0+n92ruA95zm24OLzBPcMxzke0s+QH9cY4ZMycM8+JmScZ5ZJ5xy92Jksbv/9k=";
var bytes = Convert.FromBase64String(image);
string filePath = Path.Combine(_hostingEnvironment.ContentRootPath + "/Image" , "testImage.jpeg");
using (var imageFile = new FileStream(filePath, FileMode.Create))
{
imageFile.Write(bytes, 0, bytes.Length);
imageFile.Flush();
}